Identification of Dewetting Stages and Preparation of Single Chain Gold Nanoparticle Rings by Colloidal Lithography

Strategy for Patterning Single Colloidal Gold Nanoparticles on Two Photon Polymerized and Functionalized Ultrathin Nanostructures

Local and deterministic trapping of single nanoparticles (NPs) has always been a challenging topic due to the difficulties faced at such a small particle size. These difficulties are concerned with the stability, simplicity, robustness, and efficiency of the used trapping technique. Here, we used two-photon polymerization (TPP) of a prefunctionalized photopolymer to obtain a nanometric polymer layer and selectively attract single colloidal gold NPs (AuNPs). Thanks to a deep photochemical study of the threshold energy, we identified a photopolymerization regime allowing one to tune the polymer size and immobilize single gold nanoparticles. This method is promising for the fabrication of single photon sources.

High-Temperature Wetting and Dewetting Dynamics of Silver Droplets on Molybdenum Surfaces

The wetting and dewetting behaviors of Ag droplets on Mo(100), Mo(110), and Mo(111) surfaces were investigated over 1200-2000 K via molecular dynamics simulations. We used the diffusion energy barriers of Ag droplets on the three surfaces to analyze the phenomenon of different precursor films and adsorption layers on the different surfaces. Alloying enabled the Mo(111) surface better wettability in both Mo(110) and Mo(111) surfaces, where there were significant precursor films. We observed that the dewetting rate was the fastest on the surface with the densest adsorption layer. Simulations proved that the same molecular kinetic theory model was applicable to not only the wetting process but also the dewetting process on the same surface. We also provided evidence to support the fact that an increased temperature could reduce the time to reach equilibrium for the wetting and dewetting processes.

Self assembly of nanorods on microspheres at fluid–fluid interfaces

Interfacial self-assembly of nanoparticles on curved substrates.